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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bac9fd84134cf6d6d423c6f6ce76bb3b8acea364c59f991ebd79d31ce5db575' 
  AND token = 'M3ijbF+EXv+e6dYgAY8TExO9PV0ca11SL5qDDGJW49w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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