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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4914a0a83950d4dc54dd322d12f21fecadd8d031a3bb92352ef95f44529b2672' 
  AND token = 'OPZC6Jzh9LIozovuVLIFAWzZxfpeFMj7Dcu7V4AUBsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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