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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cb9ccfa40b13f68e64de06359865a6d2c2697a4190b8b60d81464c8c6f16b6' 
  AND token = 'HQn2U0QRn6v8gR1omNsl+GmwxUncStUSA0apJ/As5Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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