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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e998bbc3dd2768a3bdf751b4bdd2b9d604d94a5543294fb3f29fab6a07823c96' 
  AND token = 'TobksRj1J4Y9WUSXkpkL9SvI1rBaXEI+jCFFazdRFBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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