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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996c9aaee213b2ffc50d5cec0420ed0df00a397a3572e4710f6005c19a8597ce' 
  AND token = '8z02AnEHYWmsmWyfxSoagOkpwANvYz0GRmfXFN2Fdw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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