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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e5cb2a5ea4f8f3db0203416e40b8127b5f998f57dc4aad16559cca0fc810f8' 
  AND token = 'Okj7S242G1bNWJfkzHgHGJwgIxssDXpatqe3ZfOGfQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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