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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88403de0f54e13601cfa44176fa6dbe5966159d803457c50baa76cc564339882' 
  AND token = '4Fr8S9xEf733et9l3+10Y3QpozFzBS3v2QEwnFs+9wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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