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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5b970ebf199441d551a71df26c858ead0cb7f3e6fb5e08473ad990691abfc4' 
  AND token = 'U5zfTyerGdosxephN9qJvwg8xHWvWZzxbRzVL3Ftm1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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