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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666b6585541baf09281d297d5191824d16b8074c2f1f8bc590f1865cc4eee6ca' 
  AND token = 'rM6DoojSdXdc0RKnyn7yaKT+ppJFht2I4CVt2zu7z1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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