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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b1603e6c98a2a22a75d99c9d89f346b36ec9aaaea98cf47fd21d473e076f56' 
  AND token = 'CPCTzORMYZq0FLeGc4FZkvlLmHpDpzRID4MdJMITn78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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