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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18101fa476415e0a641cdd30584581e44247ffed1a5f1cec29dcb4133c202424' 
  AND token = 'GsR6DchFVVLumaB4fCXHQ58T/i+18XPgskzuR68Y9VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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