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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fc642decb8a10ba8bba332ce11f7cf4c38091850a5ba1447664c47d7bcc9cc' 
  AND token = '42kejmbVA5STwHw0+yzMQL7lT8UWi1wJJ2Oz59h9Afg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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