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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e7764f48455940213bf1992eba29256ab40855d52c5c61a54938933b411c4b' 
  AND token = '67WFVWJbzW8/OXCatpW8p6ihFga0wXTkPNQtdVg5J1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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