SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b7ccfa389e54bb0d1c5e1a5564500a7ec0648a852b9fa9072d42b6f107e839' 
  AND token = 'l1FpQUhJKe6+dz66PbVZd09A6ZYM7PgrlBKl4I/GQG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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