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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf6aed2982f2d3ffde9da193200e7efe6cc22a650738c5b0639740a5e63705b' 
  AND token = 'mJhgawZNjZbNvOua0FFa0xJPQN2jM9qslNk3nsQYaYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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