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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465b702b8485594961ce9a5b6c460ed37506b0718cfd8f398e2d60a32c637d25' 
  AND token = 'pnr4nrObM1YQc2eIjf/u6w7YltPuONOufO9EhGFt9Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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