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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd761ac584fa01ee2127c3708e8f6d02d7be680d2dc7b9b2752e9a76a6a5c03' 
  AND token = 'wgko8s86dqnq/TViKtB9B3Zm79Lopp3tGsATY3HmKfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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