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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfa80ee3d7c089e532d92a95b908428653591ec0c53e3f3037b59038f05af28' 
  AND token = 'oWaxmlHD1DSHcoCke4nRRuCoCN0ikCP0Tv6VafaEmik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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