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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcaaf46c8ae3101d881e07595c100eeaa27c615c787c6d1fd4d2dd2ed54a92b' 
  AND token = 'FenagFSe7i1r+ifn0o7YBMq5LPFUvkN9cubhN8qIOwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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