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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44a14edc73369f65b457292d0a2476a6c4ddf202bf0118fe81a7cefdf2f92e8' 
  AND token = 'kUpWVPS5TGeVQJEl2VSM1Vpf5P8SP76bWbes+c23S/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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