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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de0f03f9105b2dba0697454fdf4595cdee3cf484615c6d50ce2430262760e2d' 
  AND token = 'SZSSwemLsv3RdsMaN6EiKTIHwKVqda2t34KZ8aT7OP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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