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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a48c08da17270772e8b3814bb1a336197b665f044b27f54e1b70bb3758d2c4' 
  AND token = 'ukcNW5kyxHRIN36yh20PAdIuLVJtJ5ghC5RXXbkWU0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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