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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd816c45d0e2dba6d10467873de8a769b25a998ff3cb80038756c27b77100e6' 
  AND token = 'D5Ff6KWa3pw3LdgSpsgNZ5VfQG0WP7HGCFZJaeltyv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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