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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94a5068d987080fcd21e2c8c792dbb30e93bbb79e27d0740781d555c8211dcf' 
  AND token = 'DHWW4Lk1IkAYIUonmxHYD5vWYw/YDDG+pBT/aun+NeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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