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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85c3dbd953df30e90fce078253fdaa25a7004f943a4fca5ef51927d21455c85' 
  AND token = 'oY1e7AtZ/SZnTWH+7HNu3Be8LcknbB2E50ioLM2u4yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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