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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114b4de771f63911ee6f8b76e0bd3ab61d75cabe248995252a5c31f8df464402' 
  AND token = 'm7b/9ODoLuoeXzQlve6zhP9+gHdCc6WqeRliwkgxD44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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