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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58efd5d5514a760bc0c53fee23e58fc3f3b9ea41952c634b28a640bba1887ac' 
  AND token = 'NWmWDY7wxR5yfu6m7otLn+bHyzmAr3V607yoISX1ZrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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