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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc55e6022fb72d70032be38df1100522e5d384b06e9e48ef225c306374796ad' 
  AND token = '75wqsY5hEsRYdTLJ2OyIlGCxSSekfGc9qttfKKGzmLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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