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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23641d75bb1b2f2687387f151295a716d75878d86bcf238adaba6301f49f723' 
  AND token = '7MFigJ4yhqOs2afMkeRAqsIQUi3dHFXRVok5gsggshw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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