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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b260dfe8f6cb52a37698e11f7670a422081a0d82f94ec00ac8a56ac8d71e787b' 
  AND token = 'pHEjv+REvx29E0HqkY2LfVHcurF/FiIaQgApJQ0t94U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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