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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f951e730eec7934c260b455a463d31e991058b7f62f4e3527cbc067a0de73b4f' 
  AND token = 'byz8uLUXhZYIu+UGiQYAzAOdgkzlJ5Wo2cWI4lfGgeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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