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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e41dcb7ed0426dbc9db66381e1e0a5798e4cebda93862b45a07a39596d8385' 
  AND token = 'UerPCSJ331hji81THhb1bSM4Of65kqZlSephf5Tz0/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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