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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d50fddcb24a424c487ee2e8788c8efdedbf1e6a296f39b791443cdb6904ff4d' 
  AND token = '15g2kdFTA8Yh5RT1OsYw2DulnOZav14ZCtpLaxy/fiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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