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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41760ad2c1d99d9e2b2bbba799e6f28fd28163f82a4d84018b929e20610440e9' 
  AND token = 'z95Px1IkSvZ2zT7cp8zKObFWmjWDAjhDnAaLedj/jmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}