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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066b1ba5b41389b1564bb8add101a64971cc4557e0814e9a403747f55d971985' 
  AND token = '4EJroNEqRGKfydugu6I3rwQTMDOx2gIMAt+pZHi7K6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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