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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d258db965c77f02118cdd74f14dbc80b5d5d7074792e8195447c2a75ea9360' 
  AND token = 'h67m10ZAdfEiK67CzuliHkzxiwxfhVLfe9hF6LxJ6XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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