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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e9b83fe7c48019181d21df32593bb0e3327f3415fe90abbb5665fa37f43f3e' 
  AND token = 'hpzloKV4zxsrE7RD49X2Q50e00rGS20B97DNPA86dh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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