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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3083587ba56a17036d8a171d520d61124e0304b90869150bb9d06be8b48b4824' 
  AND token = '6RhcELcfkmITbqfqaH3avxWW253ZxGC4kO+If6xiBhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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