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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a854dc6b01684761a501002805c942613a9ac3ad9265b932c4bb215b0d4dbc6f' 
  AND token = 'NFYn1HxIbB2cOPEQ7cE2k0aDYo9Tnpp/69KZQXgCfhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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