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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32196fc8604d04859bf88afdec8ce7852ea467c790ead9949bb7ecc699140fdf' 
  AND token = 'LeVW+c79sOM2HAx5A3CxIjdzfzZoezGCFwF+oaS7j8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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