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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97cc2f5ca005c95a0a84994b8aa002e3373d14637ef0cf2074812e6bb595e99' 
  AND token = 'd98SvRwwwf5hAyJLukygsHrTfCUMOLidO43VobNeABg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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