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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886735874bdd85a1e686f03427e9f91c4eb4e7259134e42c86b6a99f8ba3fa5f' 
  AND token = 'cgxcLkj7AtfLSCnRP2utz615zPd/jYlv30hPh4G3Te8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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