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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793206ee7140581725ab8e5bf4f99a3bf24ce3f31322d5eebceb33308d1ea77d' 
  AND token = 'HJOowdf+R97Y7ru9JnsdTDaQEp8IdTdr6SGqLLBNMMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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