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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dff910c7749934664a5fdd35e0c16aad6a6cfe9fb8a7650a13b99bf1a4543c0' 
  AND token = 'aALLrIQtp2lYGDPCM/D26Ao9AxnP/lfNtvCCcOKYHp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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