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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3be50ebda7a0fa1b67fca9cb09be738478135c7a1ba4dc6293edabb1cf6658' 
  AND token = 'm7s4uJN60sVRrpPKfbe/eM7g+aZvLFnBHKU+QDjFLFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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