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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed2f1bfcbf31345a49a9c5de2b940a72631129dba35582caffeedf4db2a7cd0' 
  AND token = 'OkBlDJx1I1lht6H5GXUef/P5OdhH/1l9LZijmVNIpls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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