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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b518060b283f1494ca11270fec7d7613df3f3122b44fa79d750f5e80746415ba' 
  AND token = 'AFrRNQBotbRWSxR26V+OqRcLlk3Ds0W92hkNCGYkV2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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