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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d632fbfcd32a0f193144d6ddb69cdd30987fc5c1c5388e9bcdc1748643975b6' 
  AND token = '1lLs4zutlitKswlxdS4afYGV8W/2YvIh62dXNzCLSss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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