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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516c7f0e57674ea0e468b6817ae90560e91d778e7ee864b26884fc25db7127e5' 
  AND token = 'ib2Dmws1G/1pGz5cHFcEe8hErqrATzBb9eLQlublhhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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