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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb57bfdcf3398c300e7ae49f8f0c86d5174b7ea5734273a35cf3de11d0d81e7b' 
  AND token = 'J70BYWjky7YLSsEOXOQ+fhtv8LiQyrdLFBJnb3txdTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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