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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045176fa965e3ebbc5a9b43e89f64908c3f2b8dd6d6374040df4ac50ddf23600' 
  AND token = '4OotBHAb++ljSebGbZygIBF2e1us3J5EuR6asij/tIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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