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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f3f4c78e0656d63faea87f770f9285ffeb48c6bd450c745c9ca2e61b012e08' 
  AND token = 'H4XCcR3fVUcgMeAWNp42XR2ED8WbLeba99BBCE2t+RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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