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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ec7344d3516e1390889b8b45075dc45dda9e31328a9e78dddf2aa2533c78a7' 
  AND token = '6nXQQaHvrOkcHDxAGkvVAFdRMpgejcuxJleICGNphTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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