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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aaf6da246602eefb764dede66273ea7c90820700181ef0f840c47f4fc6cc902' 
  AND token = '9pfoDk3wJNGHXZpG19X52njH64A1BnhwuQvQDbWo3/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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