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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1058feb4562b0f2f5c3f11082f5e1270e625ab623ea6778899f5eab95fe3807b' 
  AND token = 'an8daGRCfhF//0h02cy57Wq+aXzmmAVUnT1C/uFyqTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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