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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20eb2661f82cdacf859582237cba8f4444f1235e9eb1d2005d61593560a8024c' 
  AND token = '7sxc6c5AnU95EXJP+dds7WQ7QNqBnrUJmrn/XzpYdeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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