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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3285d482320de1e44d40b4cb0c9e1143b7929cb6ffc2986268e726579c0bf94' 
  AND token = 'pHuK6seX8td3znKoZtpmS8n5HVJnS8rPkeLvmXkhBsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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