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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a51f0e616975f100b3b4aa14b0efab67f9f5a203b3c45535d5d55b908cb2d99' 
  AND token = 'MKeBJAZnWT9kdyYoKrwHuwD7TM9Nh7zfqI+b3VrAnlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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